If the fabric is good, I would fix any seams that are not sturdy. If the fabric isn't good enough in some blocks, I would set them aside. The lesser quality blocks I would put together in dog blanket size and see if the humane society would like them for the cages.
I know some people like to show all the charity quilts but just say some were all ready donated. I know that doesn't fix the quality control but the dog will appreciate some new blankets too.